3-FMA Facts
Stimulant;
Description
3-FMA (3-fluoromethamphetamine) is a synthetic stimulant of the phenethylamine class. It works by flooding synapses with dopamine, norepinephrine, and serotonin,[1] producing stimulation, energy, and motivation.
Subjective effects include cognitive stimulation, physical energy, euphoria, enhanced sociability, and increased motivation. The experience is functional and task-oriented — closer to a productivity tool than the empathogenic warmth of more serotonergic stimulants,[2] and less intense than methamphetamine overall.
3-FMA carries abuse liability comparable to methamphetamine in rodent models,[3] and high doses damage dopamine-producing brain regions through oxidative stress.[4] Combining it with MAOIs can trigger fatal serotonin overload or dangerous blood pressure spikes.
Dose and durationby route · individual sensitivity varies
Starts in 20 – 60 minLasts 3 – 7 hoursAfter-effects 6 – 12 hours
Body and dependence
- Acute toxicity
- Moderate
- Chronic toxicity
- Moderate
- Physical dependence
- Low
- Psychological dependence
- High
- Withdrawal
- Mild
- Compulsive redosing
- High
Tolerance
- Builds
- Moderate
- Fully resets after
- 14 days
- Carries over to
- amphetamine;
methamphetamine; MDMA; other monoamine releasing agents
Effectslikely at a common dose
- Perception
- none likely · 6 possible
- Body
- Appetite suppression;
Stimulation; Wakefulness; +20 possible, including Insomnia, Vasoconstriction, Dehydration sensation - Thinking
- none likely · 18 possible, including Compulsive redosing urge, Cognitive dysphoria
- Feeling
- none likely · 9 possible, including Anxiety, Dysphoria, Depression
- Self
- none likely · 9 possible, including Craving, Compulsive repetitive behavior, Ego inflation
- Awareness
- Sustained attention (vicara);
+1 possible
Who shouldn't take it
Combinations60 recorded
Seek help immediately if
- Chest pain; racing, pounding, or irregular heartbeat
- Very high body temperature; heavy sweating; hot, flushed skin
- Severe agitation, paranoia, panic, or confusion
- Severe headache; muscle rigidity or twitching
- Seizures
- Signs of stroke — face drooping, one-sided weakness, slurred speech
- Difficulty breathing; collapse or unconsciousness
What to do
- Call emergency services for chest pain, overheating, seizure, or unresponsiveness
- Move them to a cool, quiet place and reduce stimulation
- Cool the body — remove excess clothing, apply cool damp cloths, fan them
- Keep them calm; reassure — panic worsens the cardiovascular strain
- If seizing, protect from injury (don't restrain); recovery position afterward
- Monitor breathing and be ready to give rescue breaths / CPR
Most stimulant overdoses settle with cooling, a calm environment, and time. The medical danger is hyperthermia, cardiac events (arrhythmia, heart attack, stroke), and seizures — get help immediately if any appear.
988 Suicide & Crisis LifelineFireside Project: 62-FIRESIDE
References
- [1]^Fleckenstein AE, Volz TJ, Riddle EL, Gibb JW, Hanson GR (2007) New insights into the mechanism of action of amphetamines — Annual Review of Pharmacology and Toxicology PMID:17209801
- [2]^Rickli A, Hoener MC, Liechti ME (2015) Monoamine transporter and receptor interaction profiles of novel psychoactive substances: para-halogenated amphetamines and pyrovalerone cathinones — European Neuropsychopharmacology doi:10.1016/j.euroneuro.2014.12.012
- [3]^Ryu IS, Yoon SS, Choi MJ, Lee YE, Kim JS, Kim WH, Cheong JH, Kim HJ, Jang CG, Lee YS, Steffensen SC, Ka M, Woo DH, Jang EY, Seo JW (2020) The potent psychomotor, rewarding and reinforcing properties of 3-fluoromethamphetamine in rodents. — Addiction Biology doi:10.1111/adb.12846
- [4]^Nguyen PT, Shin EJ, Dang DK, Tran HQ, Jang CG, Jeong JH, Lee YJ, Lee HJ, Lee YS, Yamada K, Nabeshima T, Kim HC (2018) Role of dopamine D1 receptor in 3-fluoromethamphetamine-induced neurotoxicity in mice. — Neurochemistry International doi:10.1016/j.neuint.2017.11.017